Commit | Line | Data |
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e9be9d5e MS |
1 | /* |
2 | * | |
3 | * Copyright (C) 2011 Novell Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
3a1e819b | 11 | #include <linux/uuid.h> |
e9be9d5e | 12 | |
e9be9d5e | 13 | enum ovl_path_type { |
38e813db MS |
14 | __OVL_PATH_UPPER = (1 << 0), |
15 | __OVL_PATH_MERGE = (1 << 1), | |
59548503 | 16 | __OVL_PATH_ORIGIN = (1 << 2), |
e9be9d5e MS |
17 | }; |
18 | ||
1afaba1e MS |
19 | #define OVL_TYPE_UPPER(type) ((type) & __OVL_PATH_UPPER) |
20 | #define OVL_TYPE_MERGE(type) ((type) & __OVL_PATH_MERGE) | |
59548503 | 21 | #define OVL_TYPE_ORIGIN(type) ((type) & __OVL_PATH_ORIGIN) |
d837a49b | 22 | |
fe2b7595 AG |
23 | #define OVL_XATTR_PREFIX XATTR_TRUSTED_PREFIX "overlay." |
24 | #define OVL_XATTR_OPAQUE OVL_XATTR_PREFIX "opaque" | |
02b69b28 | 25 | #define OVL_XATTR_REDIRECT OVL_XATTR_PREFIX "redirect" |
3a1e819b | 26 | #define OVL_XATTR_ORIGIN OVL_XATTR_PREFIX "origin" |
ee1d6d37 | 27 | #define OVL_XATTR_IMPURE OVL_XATTR_PREFIX "impure" |
3a1e819b AG |
28 | |
29 | /* | |
30 | * The tuple (fh,uuid) is a universal unique identifier for a copy up origin, | |
31 | * where: | |
32 | * origin.fh - exported file handle of the lower file | |
33 | * origin.uuid - uuid of the lower filesystem | |
34 | */ | |
35 | #define OVL_FH_VERSION 0 | |
36 | #define OVL_FH_MAGIC 0xfb | |
37 | ||
38 | /* CPU byte order required for fid decoding: */ | |
39 | #define OVL_FH_FLAG_BIG_ENDIAN (1 << 0) | |
40 | #define OVL_FH_FLAG_ANY_ENDIAN (1 << 1) | |
41 | ||
42 | #define OVL_FH_FLAG_ALL (OVL_FH_FLAG_BIG_ENDIAN | OVL_FH_FLAG_ANY_ENDIAN) | |
43 | ||
44 | #if defined(__LITTLE_ENDIAN) | |
45 | #define OVL_FH_FLAG_CPU_ENDIAN 0 | |
46 | #elif defined(__BIG_ENDIAN) | |
47 | #define OVL_FH_FLAG_CPU_ENDIAN OVL_FH_FLAG_BIG_ENDIAN | |
48 | #else | |
49 | #error Endianness not defined | |
50 | #endif | |
51 | ||
52 | /* On-disk and in-memeory format for redirect by file handle */ | |
53 | struct ovl_fh { | |
54 | u8 version; /* 0 */ | |
55 | u8 magic; /* 0xfb */ | |
56 | u8 len; /* size of this header + size of fid */ | |
57 | u8 flags; /* OVL_FH_FLAG_* */ | |
58 | u8 type; /* fid_type of fid */ | |
01633fd2 | 59 | uuid_t uuid; /* uuid of filesystem */ |
3a1e819b AG |
60 | u8 fid[0]; /* file identifier */ |
61 | } __packed; | |
e9be9d5e | 62 | |
39b681f8 MS |
63 | #define OVL_ISUPPER_MASK 1UL |
64 | ||
e9be9d5e MS |
65 | static inline int ovl_do_rmdir(struct inode *dir, struct dentry *dentry) |
66 | { | |
67 | int err = vfs_rmdir(dir, dentry); | |
68 | pr_debug("rmdir(%pd2) = %i\n", dentry, err); | |
69 | return err; | |
70 | } | |
71 | ||
72 | static inline int ovl_do_unlink(struct inode *dir, struct dentry *dentry) | |
73 | { | |
74 | int err = vfs_unlink(dir, dentry, NULL); | |
75 | pr_debug("unlink(%pd2) = %i\n", dentry, err); | |
76 | return err; | |
77 | } | |
78 | ||
79 | static inline int ovl_do_link(struct dentry *old_dentry, struct inode *dir, | |
80 | struct dentry *new_dentry, bool debug) | |
81 | { | |
82 | int err = vfs_link(old_dentry, dir, new_dentry, NULL); | |
83 | if (debug) { | |
84 | pr_debug("link(%pd2, %pd2) = %i\n", | |
85 | old_dentry, new_dentry, err); | |
86 | } | |
87 | return err; | |
88 | } | |
89 | ||
90 | static inline int ovl_do_create(struct inode *dir, struct dentry *dentry, | |
91 | umode_t mode, bool debug) | |
92 | { | |
93 | int err = vfs_create(dir, dentry, mode, true); | |
94 | if (debug) | |
95 | pr_debug("create(%pd2, 0%o) = %i\n", dentry, mode, err); | |
96 | return err; | |
97 | } | |
98 | ||
99 | static inline int ovl_do_mkdir(struct inode *dir, struct dentry *dentry, | |
100 | umode_t mode, bool debug) | |
101 | { | |
102 | int err = vfs_mkdir(dir, dentry, mode); | |
103 | if (debug) | |
104 | pr_debug("mkdir(%pd2, 0%o) = %i\n", dentry, mode, err); | |
105 | return err; | |
106 | } | |
107 | ||
108 | static inline int ovl_do_mknod(struct inode *dir, struct dentry *dentry, | |
109 | umode_t mode, dev_t dev, bool debug) | |
110 | { | |
111 | int err = vfs_mknod(dir, dentry, mode, dev); | |
112 | if (debug) { | |
113 | pr_debug("mknod(%pd2, 0%o, 0%o) = %i\n", | |
114 | dentry, mode, dev, err); | |
115 | } | |
116 | return err; | |
117 | } | |
118 | ||
119 | static inline int ovl_do_symlink(struct inode *dir, struct dentry *dentry, | |
120 | const char *oldname, bool debug) | |
121 | { | |
122 | int err = vfs_symlink(dir, dentry, oldname); | |
123 | if (debug) | |
124 | pr_debug("symlink(\"%s\", %pd2) = %i\n", oldname, dentry, err); | |
125 | return err; | |
126 | } | |
127 | ||
128 | static inline int ovl_do_setxattr(struct dentry *dentry, const char *name, | |
129 | const void *value, size_t size, int flags) | |
130 | { | |
131 | int err = vfs_setxattr(dentry, name, value, size, flags); | |
132 | pr_debug("setxattr(%pd2, \"%s\", \"%*s\", 0x%x) = %i\n", | |
133 | dentry, name, (int) size, (char *) value, flags, err); | |
134 | return err; | |
135 | } | |
136 | ||
137 | static inline int ovl_do_removexattr(struct dentry *dentry, const char *name) | |
138 | { | |
139 | int err = vfs_removexattr(dentry, name); | |
140 | pr_debug("removexattr(%pd2, \"%s\") = %i\n", dentry, name, err); | |
141 | return err; | |
142 | } | |
143 | ||
144 | static inline int ovl_do_rename(struct inode *olddir, struct dentry *olddentry, | |
145 | struct inode *newdir, struct dentry *newdentry, | |
146 | unsigned int flags) | |
147 | { | |
148 | int err; | |
149 | ||
2773bf00 | 150 | pr_debug("rename(%pd2, %pd2, 0x%x)\n", |
e9be9d5e MS |
151 | olddentry, newdentry, flags); |
152 | ||
153 | err = vfs_rename(olddir, olddentry, newdir, newdentry, NULL, flags); | |
154 | ||
155 | if (err) { | |
2773bf00 | 156 | pr_debug("...rename(%pd2, %pd2, ...) = %i\n", |
e9be9d5e MS |
157 | olddentry, newdentry, err); |
158 | } | |
159 | return err; | |
160 | } | |
161 | ||
162 | static inline int ovl_do_whiteout(struct inode *dir, struct dentry *dentry) | |
163 | { | |
164 | int err = vfs_whiteout(dir, dentry); | |
165 | pr_debug("whiteout(%pd2) = %i\n", dentry, err); | |
166 | return err; | |
167 | } | |
168 | ||
e7f52429 AG |
169 | static inline struct dentry *ovl_do_tmpfile(struct dentry *dentry, umode_t mode) |
170 | { | |
171 | struct dentry *ret = vfs_tmpfile(dentry, mode, 0); | |
172 | int err = IS_ERR(ret) ? PTR_ERR(ret) : 0; | |
173 | ||
174 | pr_debug("tmpfile(%pd2, 0%o) = %i\n", dentry, mode, err); | |
175 | return ret; | |
176 | } | |
177 | ||
39b681f8 MS |
178 | static inline struct inode *ovl_inode_real(struct inode *inode, bool *is_upper) |
179 | { | |
180 | unsigned long x = (unsigned long) READ_ONCE(inode->i_private); | |
181 | ||
182 | if (is_upper) | |
183 | *is_upper = x & OVL_ISUPPER_MASK; | |
184 | ||
185 | return (struct inode *) (x & ~OVL_ISUPPER_MASK); | |
186 | } | |
187 | ||
bbb1e54d MS |
188 | /* util.c */ |
189 | int ovl_want_write(struct dentry *dentry); | |
190 | void ovl_drop_write(struct dentry *dentry); | |
191 | struct dentry *ovl_workdir(struct dentry *dentry); | |
192 | const struct cred *ovl_override_creds(struct super_block *sb); | |
7bcd74b9 | 193 | struct super_block *ovl_same_sb(struct super_block *sb); |
bbb1e54d MS |
194 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); |
195 | bool ovl_dentry_remote(struct dentry *dentry); | |
196 | bool ovl_dentry_weird(struct dentry *dentry); | |
e9be9d5e | 197 | enum ovl_path_type ovl_path_type(struct dentry *dentry); |
e9be9d5e MS |
198 | void ovl_path_upper(struct dentry *dentry, struct path *path); |
199 | void ovl_path_lower(struct dentry *dentry, struct path *path); | |
200 | enum ovl_path_type ovl_path_real(struct dentry *dentry, struct path *path); | |
201 | struct dentry *ovl_dentry_upper(struct dentry *dentry); | |
202 | struct dentry *ovl_dentry_lower(struct dentry *dentry); | |
203 | struct dentry *ovl_dentry_real(struct dentry *dentry); | |
e9be9d5e MS |
204 | struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry); |
205 | void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache); | |
e9be9d5e | 206 | bool ovl_dentry_is_opaque(struct dentry *dentry); |
ee1d6d37 | 207 | bool ovl_dentry_is_impure(struct dentry *dentry); |
c412ce49 | 208 | bool ovl_dentry_is_whiteout(struct dentry *dentry); |
5cf5b477 | 209 | void ovl_dentry_set_opaque(struct dentry *dentry); |
a6c60655 | 210 | bool ovl_redirect_dir(struct super_block *sb); |
a6c60655 MS |
211 | const char *ovl_dentry_get_redirect(struct dentry *dentry); |
212 | void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect); | |
e9be9d5e | 213 | void ovl_dentry_update(struct dentry *dentry, struct dentry *upperdentry); |
bbb1e54d MS |
214 | void ovl_inode_init(struct inode *inode, struct inode *realinode, |
215 | bool is_upper); | |
39b681f8 | 216 | void ovl_inode_update(struct inode *inode, struct inode *upperinode); |
bbb1e54d MS |
217 | void ovl_dentry_version_inc(struct dentry *dentry); |
218 | u64 ovl_dentry_version_get(struct dentry *dentry); | |
219 | bool ovl_is_whiteout(struct dentry *dentry); | |
e9be9d5e | 220 | struct file *ovl_path_open(struct path *path, int flags); |
39d3d60a AG |
221 | int ovl_copy_up_start(struct dentry *dentry); |
222 | void ovl_copy_up_end(struct dentry *dentry); | |
f3a15685 AG |
223 | bool ovl_check_dir_xattr(struct dentry *dentry, const char *name); |
224 | int ovl_check_setxattr(struct dentry *dentry, struct dentry *upperdentry, | |
225 | const char *name, const void *value, size_t size, | |
226 | int xerr); | |
227 | int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry); | |
228 | ||
229 | static inline bool ovl_is_impuredir(struct dentry *dentry) | |
230 | { | |
231 | return ovl_check_dir_xattr(dentry, OVL_XATTR_IMPURE); | |
232 | } | |
233 | ||
e9be9d5e | 234 | |
bbb1e54d MS |
235 | /* namei.c */ |
236 | int ovl_path_next(int idx, struct dentry *dentry, struct path *path); | |
237 | struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags); | |
238 | bool ovl_lower_positive(struct dentry *dentry); | |
e9be9d5e MS |
239 | |
240 | /* readdir.c */ | |
241 | extern const struct file_operations ovl_dir_operations; | |
242 | int ovl_check_empty_dir(struct dentry *dentry, struct list_head *list); | |
243 | void ovl_cleanup_whiteouts(struct dentry *upper, struct list_head *list); | |
244 | void ovl_cache_free(struct list_head *list); | |
45aebeaf | 245 | int ovl_check_d_type_supported(struct path *realpath); |
eea2fb48 MS |
246 | void ovl_workdir_cleanup(struct inode *dir, struct vfsmount *mnt, |
247 | struct dentry *dentry, int level); | |
e9be9d5e MS |
248 | |
249 | /* inode.c */ | |
250 | int ovl_setattr(struct dentry *dentry, struct iattr *attr); | |
5b712091 MS |
251 | int ovl_getattr(const struct path *path, struct kstat *stat, |
252 | u32 request_mask, unsigned int flags); | |
e9be9d5e | 253 | int ovl_permission(struct inode *inode, int mask); |
0e585ccc AG |
254 | int ovl_xattr_set(struct dentry *dentry, const char *name, const void *value, |
255 | size_t size, int flags); | |
0eb45fc3 AG |
256 | int ovl_xattr_get(struct dentry *dentry, const char *name, |
257 | void *value, size_t size); | |
e9be9d5e | 258 | ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size); |
39a25b2b | 259 | struct posix_acl *ovl_get_acl(struct inode *inode, int type); |
2d902671 | 260 | int ovl_open_maybe_copy_up(struct dentry *dentry, unsigned int file_flags); |
d719e8f2 | 261 | int ovl_update_time(struct inode *inode, struct timespec *ts, int flags); |
0956254a | 262 | bool ovl_is_private_xattr(const char *name); |
e9be9d5e | 263 | |
ca4c8a3a | 264 | struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev); |
51f7e52d | 265 | struct inode *ovl_get_inode(struct super_block *sb, struct inode *realinode); |
e9be9d5e MS |
266 | static inline void ovl_copyattr(struct inode *from, struct inode *to) |
267 | { | |
268 | to->i_uid = from->i_uid; | |
269 | to->i_gid = from->i_gid; | |
07a2daab | 270 | to->i_mode = from->i_mode; |
d719e8f2 MS |
271 | to->i_atime = from->i_atime; |
272 | to->i_mtime = from->i_mtime; | |
273 | to->i_ctime = from->i_ctime; | |
e9be9d5e MS |
274 | } |
275 | ||
276 | /* dir.c */ | |
277 | extern const struct inode_operations ovl_dir_inode_operations; | |
3d27573c | 278 | struct dentry *ovl_lookup_temp(struct dentry *workdir); |
32a3d848 AV |
279 | struct cattr { |
280 | dev_t rdev; | |
281 | umode_t mode; | |
282 | const char *link; | |
283 | }; | |
e9be9d5e | 284 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
32a3d848 | 285 | struct cattr *attr, |
e9be9d5e MS |
286 | struct dentry *hardlink, bool debug); |
287 | void ovl_cleanup(struct inode *dir, struct dentry *dentry); | |
288 | ||
289 | /* copy_up.c */ | |
290 | int ovl_copy_up(struct dentry *dentry); | |
9aba6521 | 291 | int ovl_copy_up_flags(struct dentry *dentry, int flags); |
e9be9d5e MS |
292 | int ovl_copy_xattr(struct dentry *old, struct dentry *new); |
293 | int ovl_set_attr(struct dentry *upper, struct kstat *stat); |